[Chameleon-dev] [Bug 1135] New: ROIPolygonTool widget - goROIPolygonObj properties are lost

bugzilla-daemon at bugzilla.maptools.org bugzilla-daemon at bugzilla.maptools.org
Mon Sep 5 02:57:04 EDT 2005


           Summary: ROIPolygonTool widget - goROIPolygonObj properties are
           Product: Chameleon
           Version: 2.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Widget
        AssignedTo: chameleon-dev at lists.maptools.org
        ReportedBy: jacob.delfos at maunsell.com

I *think* this may be a bug....

I am trying to access the aNodeCoords array, to get the nodes for the polygon
object. However, it is always empty after the polygon is finished. This makes it
impossible to get the nodes out for polygons that have already been created. 

On line 646, the polygon is closed (finished), added to goCWCROIManager, and
ROIPolygonToolClearPolygon() is called. Here, goROIPolygonObj is "emptied", by
re-initialising the aNodeCoords array holding the nodes. But because
goROIPolygonObj is passed by reference when added to goCWCROIManager, it means
the aNodeCoords array of the finished polygon is emptied as well.

It appears that polygons added to goCWCROIManager all point to the same
goROIPolygonObj. When I put in code to create a new instance of a CWCPolygonROI
object, the problem goes away. I have inserted the following lines on line 729,
before "//reset":

    // create new object, not to overwrite the old one
    goROIPolygonObj = new CWCPolygonROI({$nPoints});
    goROIPolygonObj.pointImageWidth = 6;
    goROIPolygonObj.nodeImageWidth = 7;
    goROIPolygonObj.left = gMapWhspc;
    goROIPolygonObj.top = gMapWvspc;
    goROIPolygonObj.right = gMapWhspc + gMapWiWidth;
    goROIPolygonObj.bottom = gMapWvspc + gMapWiHeight;
    goROIPolygonObj.edgeColor = goCWCROIManager.szEdgeColor;
    goROIPolygonObj.edgeWidth = goCWCROIManager.nEdgeWidth;
    goROIPolygonObj.fillLayer = goCWCROIManager.bUseFill;
    goROIPolygonObj.fillColor = goCWCROIManager.szFillColor;
    goROIPolygonObj.fillOpacity = goCWCROIManager.nFillOpacity;  
    // show the polygon

I can update the CVS, but would prefer if someone more experienced with this
widget would double-check.


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